﻿(function (window) {
    //兼容
    window.URL = window.URL || window.webkitURL;
    navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
    // console.log(navigator.getUserMedia);
    var HZRecorder = function (stream, config) {
        config = config || {};
        config.sampleBits = config.sampleBits || 8;      //采样数位 8, 16
        config.sampleRate = config.sampleRate || (44100 / 6);   //采样率(1/6 44100)

        // var context = new (window.webkitAudioContext || window.AudioContext)();
        window.AudioContext = (window.AudioContext || window.webkitAudioContext);
        if (window.AudioContext) {
            var context = new window.AudioContext();////创建一个音频环境对像
        } else {
            console.log('not support web audio api');
        }
        var audioInput = context.createMediaStreamSource(stream);//将声音输入这个对像
        var createScript = context.createScriptProcessor || context.createJavaScriptNode;
        var recorder = createScript.apply(context, [4096, 1, 1]);

        var audioData = {
            size: 0          //录音文件长度
            , buffer: []     //录音缓存
            , inputSampleRate: context.sampleRate    //输入采样率
            , inputSampleBits: 16       //输入采样数位 8, 16
            , outputSampleRate: config.sampleRate    //输出采样率
            , oututSampleBits: config.sampleBits       //输出采样数位 8, 16
            , input: function (data) {
                this.buffer.push(new Float32Array(data));
                this.size += data.length;
            }
            , compress: function () { //合并压缩
                //合并
                var data = new Float32Array(this.size);
                var offset = 0;
                for (var i = 0; i < this.buffer.length; i++) {
                    data.set(this.buffer[i], offset);
                    offset += this.buffer[i].length;
                }
                //压缩
                var compression = parseInt(this.inputSampleRate / this.outputSampleRate);
                var length = data.length / compression;
                var result = new Float32Array(length);
                var index = 0, j = 0;
                while (index < length) {
                    result[index] = data[j];
                    j += compression;
                    index++;
                }
                return result;
            }
            , EncodeAudio: function (_type) {
                var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);
                var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);
                var bytes = this.compress();
                var dataLength = bytes.length * (sampleBits / 8);
                var buffer = new ArrayBuffer(44 + dataLength);
                var data = new DataView(buffer);
                // console.log(44 + dataLength);
                // console.log(dataLength);
                // console.log(data);
                var channelCount = 1;//单声道
                var offset = 0;

                var writeString = function (str) {
                    for (var i = 0; i < str.length; i++) {
                        data.setUint8(offset + i, str.charCodeAt(i));
                    }
                }

                // 资源交换文件标识符
                writeString('RIFF');
                offset += 4;
                // 下个地址开始到文件尾总字节数,即文件大小-8
                data.setUint32(offset, 36 + dataLength, true);
                offset += 4;
                // WAV文件标志
                writeString('WAVE');
                offset += 4;
                // 波形格式标志
                writeString('fmt ');
                offset += 4;
                // 过滤字节,一般为 0x10 = 16
                data.setUint32(offset, 16, true);
                offset += 4;
                // 格式类别 (PCM形式采样数据)
                data.setUint16(offset, 1, true);
                offset += 2;
                // 通道数
                data.setUint16(offset, channelCount, true);
                offset += 2;
                // 采样率,每秒样本数,表示每个通道的播放速度
                data.setUint32(offset, sampleRate, true);
                offset += 4;
                // 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8
                data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true);
                offset += 4;
                // 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8
                data.setUint16(offset, channelCount * (sampleBits / 8), true);
                offset += 2;
                // 每样本数据位数
                data.setUint16(offset, sampleBits, true);
                offset += 2;
                // 数据标识符
                writeString('data');
                offset += 4;
                // 采样数据总数,即数据总大小-44
                data.setUint32(offset, dataLength, true);
                offset += 4;
                // 写入采样数据
                if (sampleBits === 8) {
                    for (var i = 0; i < bytes.length; i++, offset++) {
                        var s = Math.max(-1, Math.min(1, bytes[i]));
                        var val = s < 0 ? s * 0x8000 : s * 0x7FFF;
                        val = parseInt(255 / (65535 / (val + 32768)));
                        data.setInt8(offset, val, true);
                    }
                } else {
                    for (var i = 0; i < bytes.length; i++, offset += 2) {
                        var s = Math.max(-1, Math.min(1, bytes[i]));
                        data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
                    }
                }
                // return new Blob([data], { type: 'audio/wav' });//mp3: audio/mpeg;Wav:audio/wav;Ogg:audio/ogg
                return new Blob([data], {type: _type});

            }
        };

        //开始录音
        this.start = function () {
            audioInput.connect(recorder);
            recorder.connect(context.destination);
        }

        //停止
        this.stop = function () {
            recorder.disconnect();

            // console.log(recorder);
        }


        //获取音频文件
        this.getBlob = function () {
            this.stop();
            return audioData.EncodeAudio('audio/mpeg');
        }

        //回放
        this.play = function (audio) {
            audio.src = window.URL.createObjectURL(this.getBlob());
        }

        //上传
        this.upload = function (url, callback, token) {
            var fd = new FormData();
            var upload_file = this.getBlob();
            fd.append("upload_file", upload_file);
            fd.append("token", token);
            fd.append("filename", 'upload_file.mp3');
            fd.append("client", 'html5');
            var xhr = new XMLHttpRequest();
            if (callback) {
                xhr.upload.addEventListener("progress", function (e) {
                    callback('uploading', e);
                }, false);
                xhr.addEventListener("load", function (e) {
                    callback('ok', e);
                }, false);
                xhr.addEventListener("error", function (e) {
                    callback('error', e);
                }, false);
                xhr.addEventListener("abort", function (e) {
                    callback('cancel', e);
                }, false);
            }
            xhr.open("POST", url);
            xhr.send(fd);
        }

        //音频采集

        this.onaudioprocess=function () {
            recorder.onaudioprocess = function (e) {
                audioData.input(e.inputBuffer.getChannelData(0));
                // return audioData
                //record(e.inputBuffer.getChannelData(0));
            }
        }
        // this.dataavailable = function () {
        //     var chunks = [];
        //     console.log('byteArray', mediaRecorder);
        //     mediaRecorder.ondataavailable = (e) => {
        //         console.log('ondataavailable', e.data)
        //         chunks.push(e.data);
        //     };
        //     console.log('chunks', chunks);
        //     return chunks
        //     // recorder.addEventListener('dataavailable', (e) => {
        //     // })
        // }

        //播放
        this.startPlay = function (audio) {
            audio.play();
        }
        //暂停播放
        this.pausePlay = function (audio) {
            //audio.src = window.URL.createObjectURL(this.getBlob());
            audio.pause();
        }
        //停止播放
        this.stopPlay = function (audio) {
            //audio.src = window.URL.createObjectURL(this.getBlob());
            audio.stop();
        }
    };
    //抛出异常
    HZRecorder.throwError = function (message) {
        alert(message);
        // throw new function () { this.toString = function () { return message; } }
    }
    //是否支持录音
    HZRecorder.canRecording = (navigator.getUserMedia != null);
    //获取录音机
    HZRecorder.get = function (callback, config) {
        if (callback) {
            if (navigator.getUserMedia) {
                navigator.getUserMedia(
                    {audio: true} //只调用音频
                    , function (stream) {
                        var rec = new HZRecorder(stream, config);
                        callback(rec);
                    }
                    , function (error) {
                        switch (error.code || error.name) {
                            case 'PERMISSION_DENIED':
                            case 'PermissionDeniedError':
                                HZRecorder.throwError('用户拒绝提供信息');
                                break;
                            case 'NOT_SUPPORTED_ERROR':
                            case 'NotSupportedError':
                                HZRecorder.throwError('浏览器不支持硬件设备');
                                break;
                            case 'MANDATORY_UNSATISFIED_ERROR':
                            case 'MandatoryUnsatisfiedError':
                                HZRecorder.throwError('无法发现指定的硬件设备');
                                break;
                            default:
                                HZRecorder.throwError('无法打开麦克风。异常信息:' + (error.code || error.name));
                                break;
                        }
                    });

                // navigator.mediaDevices.getUserMedia({ audio: true})
                //     .then(function(stream) {
                //         var rec = new HZRecorder(stream, config);
                //         callback(rec);
                //     })
                //     .catch(function(err) {
                //         switch (err.code || err.name) {
                //             case 'PERMISSION_DENIED':
                //             case 'PermissionDeniedError':
                //                 HZRecorder.throwError('用户拒绝提供信息。');
                //                 break;
                //             case 'NOT_SUPPORTED_ERROR':
                //             case 'NotSupportedError':
                //                 HZRecorder.throwError('浏览器不支持硬件设备。');
                //                 break;
                //             case 'MANDATORY_UNSATISFIED_ERROR':
                //             case 'MandatoryUnsatisfiedError':
                //                 HZRecorder.throwError('无法发现指定的硬件设备。');
                //                 break;
                //             default:
                //                 HZRecorder.throwError('无法打开麦克风。异常信息:' + (err.code || err.name));
                //                 break;
                //         }
                //     });

            } else {
                HZRecorder.throwErr('当前浏览器不支持录音功能。');
                console.log('your browser not support getUserMedia');
                return;
            }
        }
    }

    window.HZRecorder = HZRecorder;

})(window);


// // 老的浏览器可能根本没有实现 mediaDevices，所以我们可以先设置一个空的对象
// if (navigator.mediaDevices === undefined) {
//     navigator.mediaDevices = {};
// }
//
// // 一些浏览器部分支持 mediaDevices。我们不能直接给对象设置 getUserMedia
// // 因为这样可能会覆盖已有的属性。这里我们只会在没有getUserMedia属性的时候添加它。
// if (navigator.mediaDevices.getUserMedia === undefined) {
//     navigator.mediaDevices.getUserMedia = function(constraints) {
//
//         // 首先，如果有getUserMedia的话，就获得它
//         var getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
//
//         // 一些浏览器根本没实现它 - 那么就返回一个error到promise的reject来保持一个统一的接口
//         if (!getUserMedia) {
//             return Promise.reject(new Error('getUserMedia is not implemented in this browser'));
//         }
//
//         // 否则，为老的navigator.getUserMedia方法包裹一个Promise
//         return new Promise(function(resolve, reject) {
//             getUserMedia.call(navigator, constraints, resolve, reject);
//         });
//     }
// }

